Program: NOVA | Type: Clip | Aired: 2019-06-10
The 170-Year Search for a Planet Beyond Neptune
Planet Nine’s existence is not the first time astronomers have predicted a planet they couldn’t see. Clyde Tombaugh was looking for Planet X when he accidentally found Pluto. After Voyager 2 flew by Neptune in 1989, new calculations determined there was no Planet X. But three years ago, a disturbance was detected at the far reaches of the Solar System.
PBS’ premier science series helps viewers of all ages explore the science behind the headlines. Along the way, NOVA programs demystify science and technology and highlight the people involved in scientific pursuits.
Learn more about Pluto and its moon, Charon.
Getting to know Neptune, the outer-most planet.
Uranus is more than just the tilted planet in our solar system.
Jupiter is more than the biggest planet in our solar system—it's also the oldest.